Nonuniform Transition Conductivity of Superconducting Ceramic

There is an extensive international research effort underway to understand the origin of high critical temperature (Tc) superconductivity. A considerable amount of this research is directed toward increasing both the critical current density (Jc) and Tc [l–4]. In order to increase both Tc and Jc further we must understand the mechanisms supporting the superconducting state and the mechanisms that degrade this state